JPH05308024A - Chip-shaped noise eliminating filter and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a chip-shaped noise eliminating filter which can have a large current capacity and can be easily manufactured by constituting a metallic terminal of an internal and external terminals. CONSTITUTION:Through holes 13a and 13b are formed between both ends of a ferrite core. Metallic terminals 15a and 15b formed by punching a metallic plate and bending the punched metallic pieces are respectively composed of internal terminals 17a and 17b passed through the holes 13a and 13b and connected to each other at front ends protruded from the holes 13a and 13b and external terminals 18a and 18b which are joined to both end sections of the core 11 and have nearly U-shapes. The terminals 17a and 17b are integrally connected with the terminals 18a and 18b by means of connecting sections 19a and 19b which are bent so that they can reach the side face of the core 11. Since the title filter is constituted in such a way, the current capacity of the filter can be increased and the filter can be used for a circuit, such as the power source circuit, etc., through which a large current flows.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type noise elimination filter for absorbing electromagnetic interference noise in signal lines and power source lines of electronic equipment and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, this type of filter has a structure as shown in FIG. That is, in FIG. 20, reference numeral 1 is a concave ferrite core, and a recess 1a is provided in an intermediate portion of the ferrite core 1, and the chip capacitor 2 is housed in the recess 1a.

Further, the ferrite core 1 is provided with through-hole conductors 3 that form an inductance, and external electrodes 4 and intermediate electrodes 5 connected to the through-hole conductors 3 are provided at both ends and an intermediate portion. ing.

The chip capacitor 2 housed in the recess 1a of the ferrite core 1 has electrodes 2a on both ends thereof.
And one electrode 2a has a conductive piece 6 on the intermediate electrode 5.
And the other electrode 2a is connected to a portion exposed on the surface of the through-hole conductor 3 via a conductive piece.

FIG. 21 shows this equivalent circuit.

[0006]

However, in the above-mentioned conventional structure, since the conductor portion is the film-like wiring network, the current capacity cannot be made large, and it cannot be used in a circuit such as a power supply line for supplying a relatively large current. There were challenges.

Further, it is necessary to form the film-shaped conductor portions on the four surfaces of the ferrite core, which causes a problem that the manufacturing is complicated and that the dimensional variation becomes large due to the bleeding of the paste when forming the conductor. I was afraid to do it.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a chip-type noise elimination filter which has a large current capacity and is easy to manufacture.

[0009]

In order to solve the above-mentioned problems, a chip-type noise elimination filter according to the present invention comprises a rectangular ferrite core and one surface facing the other between both ends of the ferrite core. At least two through-holes provided toward each other, both ends of the ferrite core and the internal terminal which is inserted into the through-hole so that the tip portion projects into the same surface of the ferrite core and is connected by the projecting tip portion. It is composed of a metal terminal composed of an external terminal fitted into the terminal.

[0010]

With this structure, since the plate-shaped metal terminal is used, a large current capacity can be obtained, and the metal terminal is formed by the internal terminal forming the inductance and the external terminal for connecting the outside. Since it is configured, it can be easily assembled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
This will be described using 9.

(Embodiment 1) FIG. 1 is a perspective view showing a chip type noise removal filter according to an embodiment of the present invention, FIG.
3A and 3B are an external perspective view of the filter and an exploded perspective view showing terminals of the filter, respectively.
(C) is a front view, a plan view and a side view showing the filter,
FIG. 4 is a front view, a plan view and a side view showing a ferrite core of the filter.

1 to 4, reference numeral 11 denotes a rectangular ferrite core. This ferrite core 11 is provided with narrow portions 12a and 12b at both ends as shown in FIG. 4, and between the both ends. , Two through-holes 13a and 13b penetrating from one side surface to the other side surface facing each other. Grooves 14a and 14b whose bottom surfaces are flush with the narrow portions 12a and 12b are provided on opposite side surfaces of the ferrite core 11.

Reference numerals 15a and 15b are plate-shaped metal terminals formed by punching and bending a metal plate. The metal terminals 15a and 15b have the ferrite core 11 at the tips 16a and 16b in the through holes 13a and 13b. The internal terminals 17a and 17b, which are inserted so as to project in the same plane and are connected at the projecting tips, and the ferrite core 1
External terminal 18 having a substantially U-shape fitted to both end portions of 1
a and 18b. In addition, the internal terminal 17
The a and 17b and the external terminals 18a and 18b are integrally connected by connecting portions 19a and 19b, and the connecting portions 19a and 19b are formed by bending so as to come to the side surface of the ferrite core 11.

That is, the metal terminals 15a and 15b
Fits the external terminals 18a and 18b into the narrow portions 12a and 12b of the ferrite core 11, and
a, 17b are inserted into the through holes 13a, 13b from the same side face side, and the through holes 13a, 17b of the internal terminals 17a, 17b are inserted.
The tip portions 16a and 16b protruding from 13b are bent in the groove 14b toward each other and connected by cream-like solder (not shown). In addition, the connecting portion 19
The a and 19b are fitted in the groove 14b formed on the side surface of the ferrite core 11.

With this structure, the external terminals 18a,
It is possible to obtain a chip type noise removal filter in which an inductance is formed between 18b.

Further, since the narrow portions 12a and 12b are provided at both ends of the ferrite core 11 and the external terminals 18a and 18b of the metal terminals 15a and 15b are fitted into the narrow portions 12a and 12b, it is a general construction. Like the chip component, it can be a rectangular chip component.

In this embodiment, the example in which the internal terminal penetrates the ferrite core twice is shown, but the invention is not limited to this.

(Embodiment 2) FIG. 5 is a perspective view showing a chip type noise elimination filter according to another embodiment of the present invention, and FIG.
(A) and (b) are an external perspective view of the filter and an exploded perspective view showing terminals of the filter. In this embodiment, an intermediate terminal is provided to provide a high characteristic structure. Note that FIG.
6 and 6, the same parts as those shown in FIGS. 1 to 4 are designated by the same reference numerals.

Reference numeral 20 is a rectangular ferrite core, and the ferrite core 20 has through holes 13a and 13b and a through hole 2.
1a and 21b are provided.

Reference numeral 22 denotes a plate-shaped intermediate terminal formed by punching and bending a metal plate.
The tip portions 23a and 23b in the through holes 21a and 21b.
Is inserted so as to project on the same surface of the ferrite core 21 and is connected at the projecting tip end.
a and 24b, and an external terminal 25 connecting the internal terminals 24a and 24b.

That is, in the metal terminals 15a and 15b, the external terminals 18a and 18b are connected to the narrow portion 1 of the ferrite core 11.
2a, 12b and the internal terminals 17a, 17
b is inserted into the through holes 13a and 13b from the same side surface side, while the intermediate terminal 22 inserts the internal terminals 24a and 24b into the through hole 2
Internal terminals 17a and 17b are inserted into 1a and 21b from the same side. Then, the tip portions 16a and 16b protruding from the through holes 13a and 13b of the internal terminals 17a and 17b, respectively.
And the tip portions 23a and 23b protruding from the through holes 21a and 21b of the internal terminals 24a and 24b are bent in the groove 14b toward each other and connected by cream solder (not shown). Further, the external terminal 25 of the intermediate terminal 22 is fitted in the groove 20a formed on the side surface of the ferrite core 20 so that the tip end surface is flush with the bottom surface.

(Embodiment 3) FIG. 7 is a perspective view showing a chip type noise elimination filter according to another embodiment of the present invention, and FIG.
(A), (b) and (c) are respectively a front view, a plan view and a side view showing the same filter, and FIGS. 9 (a) and 9 (b) are external perspective views of the same filter and terminals of the same filter, respectively. It is an exploded perspective view, and this embodiment has a three-terminal structure by connecting a chip capacitor.

7 to 9, reference numeral 26 is a rectangular ferrite core, and the ferrite core 26 is provided with narrow portions 27a and 27b at both ends, and between the both ends, one side surface facing each other is provided. Through holes 28a, 28b and through holes 29a, 29b are provided so as to penetrate toward the other side surface. In addition, in the middle portion of the ferrite core 26, a recess 30 having openings on one side surface and a bottom surface is formed.
And the bottom surface is the same as the narrow portions 27a and 27b on the side surface provided with the recess 30.
1 is provided.

Reference numerals 32a and 32b denote plate-shaped metal terminals formed by punching and bending a metal plate. The metal terminals 32a and 32b have the ferrite core 26 at the tips 33a and 33b in the through holes 28a and 28b. The internal terminals 34a and 34b, which are inserted so as to project on the same plane and are connected at the projecting tips, and the ferrite core 2
External terminals 35, which are fitted in both ends of 6 and have a substantially U shape.
a and 35b. In addition, the internal terminal 34
The a and 34b and the external terminals 35a and 35b are integrally connected by connecting portions 36a and 36b.

Reference numeral 37 denotes a plate-shaped metal terminal formed by punching and bending a metal plate.
The tip portions 38a, 38b in the through holes 29a, 29b.
Is inserted so as to project on the same surface of the ferrite core 26 and is connected at the projecting tip portion.
a, 39b and a coupling terminal 40 for coupling the internal terminals 39a, 39b. The coupling terminal 40 is substantially Y-shaped, and the coupling terminal 40 is arranged in the groove 31 of the ferrite core 26.

Reference numeral 41 indicates a recess 3 of the ferrite core 26.
In the chip capacitor arranged in 0, electrodes 42a and 42b are provided at both ends of the chip capacitor 41, and the intermediate terminal 37 is soldered to the electrode 42a at the coupling terminal 40 portion. The one electrode 42b of the chip capacitor 41 is formed on the bottom surface of the ferrite core 26 by the external terminal 3 of the metal terminals 32a and 32b.
It is arranged flush with 5a and 35b, and serves as an external connection portion as it is.

That is, in the metal terminals 32a and 32b, the external terminals 35a and 35b are connected to the narrow portion 2 of the ferrite core 26.
7a, 27b and the internal terminals 34a, 34
b is inserted into the through holes 28a, 28b from the same side surface, while the intermediate terminal 37 connects the internal terminals 39a, 39b with the through holes 2a, 28b.
Inserted into 9a, 29b from the same side as the internal terminals 34a, 34b. Then, the tip portions 33a, 33b protruding from the through holes 28a, 28b of the internal terminals 34a, 34b.
And the tip portions 38a, 38b protruding from the through holes 29a, 29b of the internal terminals 39a, 39b are bent in the groove 31 toward each other and connected by cream solder (not shown). A chip capacitor 41 is arranged in the recess 30 of the ferrite core 26, and an electrode 42a of the chip capacitor 41 is soldered to the V-shaped portion of the Y-shaped coupling terminal 40.

Further, as shown in FIG. 10, instead of the plate-shaped intermediate terminal 37, an intermediate terminal 37a made of a lead wire may be used, and the cost can be reduced. in this case,
The intermediate terminal 37a is an electrode 42a of the chip capacitor 41.
The part to be soldered is bent into a V shape to prevent dripping.

Further, as shown in FIGS. 10 to 12, the ferrite core 26 is adhesively fixed to the external terminals 35a and 35b by the resin 46 on both side surfaces thereof, and the resin 46 flows down to the ferrite core 26. By providing the resin reservoir portion 47 for preventing this, the adhesive fixing strength is enhanced.

With this structure, the external terminals 32a,
It is possible to obtain a chip type noise elimination filter in which an inductance is formed between 32b and a capacitor is connected to the intermediate connection point.

(Embodiment 4) Next, a method for manufacturing the chip noise elimination filter of the present invention will be described.

FIGS. 13A to 13E are views showing the main steps of the method of manufacturing the chip noise elimination filter shown in FIG.

First, as shown in FIG. 13A, a hoop material 43 punched into a predetermined shape is prepared. Then, as shown in FIG. 7B, the metal terminal 1 is attached to the hoop material 43.
Bending is performed so that 5a and 15b are formed. As a result, the metal pieces 15a, 15a,
A member in which 15b are connected to each other is obtained. The state of the metal terminals 15a and 15b at this time is as follows.
a and 17b are in a state of facing upward.

Thereafter, as shown in FIG. 13C, the ferrite core 11 is fitted between the metal terminals 15a and 15b. At this time, the through holes 13a, 13 of the ferrite core 11
Insert the internal terminals 17a and 17b into the internal terminal 17b
The ferrite core 1 is attached to the tips 16a and 16b of a and 17b.
One of the through holes 13a and 13b is projected.

Thereafter, as shown in FIG. 13D, the tip portions 16a and 16b protruding from the through holes 13a and 13b are bent inward by a drill-shaped bending jig 44. As shown in FIG. 14, the bending jig 44 is in the shape of a drill having spiral grooves, and the tip has a flat surface. A process of bending the internal terminals 17a and 17b by the bending jig 44 will be described with reference to FIG.
Will be explained.

FIG. 15 is a view seen from the bending jig 44 side.
As shown in FIG. 15A, the internal terminals 17 a and 17 b of the metal terminals 15 a and 15 b are connected to the through hole 1 of the ferrite core 11.
3a, 13b, and the bending jig 44 is inserted into the internal terminal 17
It is arranged corresponding to the tip portions 16a and 16b of the a and 17b. When the bending jig 44 is rotated in this state, as shown in FIG.
As shown in (b), each tip 16a, 16b
Is pressed by the bending jig 44 toward the wall of the groove 14b of the ferrite core 11. Further, when the bending jig 44 is further rotated, FIG.
As shown in (c), the tip portions 16a and 16b are guided by the wall of the groove 14b, and the tip portions 16a and 16b are respectively guided.
Are bent so that they are parallel to each other, and the step of bending the tip portions 16a and 16b of the internal terminals 17a and 17b is completed as shown in FIG.

Further, as shown in FIGS. 16 and 17, instead of the drill-shaped bending jig 44, bending jigs 45a and 45b having acute angles at the tips are used, respectively. The parts 16a and 16b can be bent.

First, as shown in FIGS. 17A to 17D, a bending jig 45 is attached to each of the tips 16a and 16b.
a and 45b are brought into contact with each other from the directions in which the bending jigs 45a and 45b are opposed to each other, and the bending jigs 45a and 45b are respectively pushed forward, whereby the tip portion 1
Bend 6a and 16b. In this case, since the tips of the bending jigs 45a and 45b have an acute angle as shown in FIG. 16B, the bending jigs 45a and 45b respectively.
When b is gradually pushed out, the tip portions 16a and 16b
Are gradually bent and parallel to each other.

After bending the internal terminals 17a and 17b in this manner, as shown in FIG. 13 (e), cream-like solder is applied to the bent tips 16a and 16b,
After that, the cream-like solder is melted by a light beam or laser light capable of locally heating and melting, and soldering is performed. When this light beam or laser light is used for heating and melting, preheating and main heating can be easily performed by changing the focal length. Also, by performing this preliminary heating,
Soldering that does not easily generate solder balls is possible.

After assembling the metal terminals 15a and 15b into the ferrite core 11 in this manner, the metal terminal 15
By separating a and 15b from the hoop material 43, a chip type noise removal filter as shown in FIG. 1 can be obtained.

FIG. 18 is a view showing an example of a hoop material used for manufacturing the chip type noise removal filter of the embodiment shown in FIG. As shown in FIG. 18, metal terminals 32 are provided at the portions corresponding to the chip type noise removal filters one by one.
The a and 32b and the intermediate terminal 37 are joined to the hoop member 43 by a small piece 43a, and a joining piece 43b is provided between them.

FIG. 19 is a view showing an example of another hoop member 43. In this case, contrary to the hoop material 43 shown in FIG. 18, the metal terminals 32a and 32b are arranged side by side in a direction orthogonal to the longitudinal direction of the hoop material 43.
Can be effectively used without waste.

Further, as shown in FIG. 19A, the supporting portion 43c supports the external terminals 35a and 35b in the width direction of the hoop member 43 and also supports the adjacent ferrite core 26. It is provided in. In this way, since the ends of the ferrite cores 26 are arranged on the adjacent support portions 43c, the ferrite cores 26
Can be stably fixed on the hoop member 43.

[0045]

As described above, the chip-type noise elimination filter according to the present invention has at least two through holes provided from one surface facing each other between the both ends of the ferrite core, and the through holes. A metal terminal which is inserted so that the tip of the ferrite core projects on the same surface of the ferrite core and is connected at the projecting tip and an external terminal fitted to both ends of the ferrite core. Therefore, a large current capacity can be obtained, and it can be used in a circuit such as a power supply circuit in which a large current flows.

Moreover, since the metal terminal composed of the internal terminal and the external terminal is used, the effect that the metal terminal is combined with the ferrite core and the internal terminal is bent and connected can be easily assembled. can get.

[Brief description of drawings]

FIG. 1 is a perspective view showing a chip type noise removal filter according to an embodiment of the present invention with a main part seen through.

FIG. 2 (a) is an external perspective view showing a chip-type noise reduction filter according to the same embodiment. FIG. 2 (b) is an exploded perspective view showing terminals of the filter.

3 (a) to 3 (c) are a front view, a plan view and a side view showing the chip type noise removal filter according to the embodiment.

4A to 4C are a front view, a plan view and a side view showing a ferrite core of the filter.

FIG. 5 is a perspective view showing a chip type noise removal filter according to another embodiment of the present invention, with its main part seen through.

FIG. 6 (a) is an external perspective view showing a chip type noise removal filter according to the same embodiment. FIG. 6 (b) is an exploded perspective view showing terminals of the filter.

FIG. 7 is a perspective view showing a chip type noise removal filter according to another embodiment of the present invention, with its main part seen through.

8A to 8C are a front view, a plan view and a side view showing a chip type noise removal filter according to the embodiment.

FIG. 9A is an external perspective view showing a chip type noise removal filter according to the same embodiment. FIG. 9B is an exploded perspective view showing terminals of the filter.

10 (a) to (d) are a front view, a plan view, a rear view and a side view showing another chip type noise removal filter in the same embodiment.

11A to 11D are a front view, a plan view, a rear view and a side view showing a ferrite core of the filter.

FIG. 12 is a partial perspective view of a ferrite core of the filter.

13A to 13E are perspective views showing an example of a method for manufacturing a chip-type noise removal filter according to the present invention.

FIG. 14 is a perspective view showing a main process in the manufacturing method.

15 (a) to 15 (d) are plan views showing main steps in the manufacturing method.

FIG. 16A is a perspective view showing a main part process in another example of the method for manufacturing the chip type noise removal filter according to the present invention. FIG. 16B is a front view showing the bending jig in the same manufacturing method.

17 (a) to 17 (d) are plan views showing a main part process in the same method for manufacturing the chip type noise removal filter.

18 (a) to (c) are side views, plan views and front views showing essential parts in the manufacturing method.

19 (a) to 19 (c) are side views, plan views and front views showing essential parts in another manufacturing method.

FIG. 20 is a perspective view showing a conventional chip type noise removal filter.

FIG. 21 is an equivalent circuit diagram of the filter.

[Explanation of reference numerals] 11, 20, 26 Ferrite cores 12a, 12b, 27a, 27b Narrow portions 13a, 13b, 21a, 21b, 28a, 28b, 2
9a, 29b Through hole 14a, 14b Groove 15a, 15b, 32a, 32b Metal terminal 16a, 16b, 23a, 23b, 33a, 33b, 3
8a, 38b Tip part 17a, 17b, 24a, 24b, 34a, 34b, 3
9a, 39b Internal terminal 18a, 18b, 35a, 35b External terminal 19a, 19b, 36a, 36b Connecting part 22, 37, 37a Intermediate terminal 25 External terminal 30 Recess 31 Groove 40 Coupling terminal 41 Chip capacitor 42a, 42b Electrode 43 Hoop material 43a Small piece 43b Coupling piece 43c Support part 44, 45a, 45b Bending jig 46 Resin 47 Resin pool part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kasei Hata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Tatsumi Nakano, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A rectangular ferrite core, at least two through holes provided from one surface facing each other between both end portions of the ferrite core to the other surface, and a ferrite core having a tip portion in the through hole. A chip-type noise elimination filter comprising an internal terminal inserted so as to project on the same plane and connected at the tip end thereof, and a metal terminal made up of an external terminal fitted into both ends of the ferrite core. 2. A rectangular ferrite core, at least four through holes provided from one surface facing each other between both end portions of the ferrite core to the other surface, and a ferrite core having a tip portion in the through hole. A metal terminal comprising an internal terminal inserted so as to project on the same plane and connected at the tip and external terminals fitted into both ends of the ferrite core; and a through hole into which the internal terminal of the metal terminal is inserted. Is a chip-type noise elimination filter which is inserted into different through holes and is composed of an intermediate terminal connected to the internal terminal at the tip. 3. A rectangular ferrite core having a recess for arranging a chip capacitor, and at least four through holes provided from one surface facing each other between both ends of the ferrite core toward the other surface. , A metal terminal having an internal terminal inserted into the through hole such that the tip portion projects on the same surface of the ferrite core and connected at the tip portion, and an external terminal fitted into both end portions of the ferrite core; A chip type noise eliminator which is inserted into a through hole different from the through hole into which the internal terminal of the terminal is inserted, and which is composed of an intermediate terminal connected to the internal terminal at the tip and connected to one electrode of the chip capacitor filter. 4. The chip type noise elimination filter according to claim 1, wherein the metal terminal is plate-shaped. 5. The chip-type noise elimination filter according to claim 1, wherein the metal terminal is partly arranged on the side surface of the ferrite core. 6. A hoop material provided with a square ferrite core having at least two through holes from one surface facing each other between both ends and a metal terminal including an internal terminal and an external terminal. And, while inserting the internal terminal so that the tip projects into the through hole of the ferrite core to the same surface side of the ferrite core, after fitting the external terminals to both ends of the ferrite core, A method for manufacturing a chip-type noise removal filter, comprising bending the tip of the internal terminal, connecting the tip, and separating the metal terminal from the hoop material. 7. The chip type noise elimination filter according to claim 2, wherein the intermediate terminal is a lead wire. 8. A chip-type noise elimination filter according to claim 3, wherein the intermediate terminal is a V-shaped lead wire. 9. The chip-type noise elimination filter according to claim 1, wherein a resin reservoir is formed on a part of a rectangular ferrite core. 10. The tip of the internal terminal is bent by a drill-shaped bending jig having a spiral groove and a flat surface at the tip. Manufacturing method of chip type noise reduction filter. 11. The method of manufacturing a chip type noise removal filter according to claim 6, wherein the tip of the internal terminal is bent by a bending jig having an angle at the tip. 12. An external terminal is provided in parallel in a direction orthogonal to the longitudinal direction of the hoop material, and a supporting portion is provided for supporting the external terminal over the width direction of the hoop material and for supporting an adjacent ferrite core. 7. The method for manufacturing a chip type noise removal filter according to claim 6, wherein.